9
Item
Description Remark
F
Backup loads
Protected house loads directly connected to the
inverter.
G Normal Loads
Non protected house loads, they will disconnect in
case of grid failure.
2.6.2 Declaration For Back-Up Function
The following statement involves SUNGROW general policies about the hybrid inverters de-
scribed in this document.
1 For hybrid inverters, the electrical installation typically includes connection of the inverter
to both PV modules and batteries. If there is no available power from batteries or PV
modules in backup mode, the backup power supply will be automatically terminated.
SUNGROW shall hold no liability for any consequences arising from failing to observe
this instruction.
2 Normally, the Back-Up switching time is less than 20 ms. However, some external fac-
tors may cause the system to fail on Back-Up mode. Therefore, the users must be aware
of conditions and follow the instructions as below:
• Do not connect loads that are dependent on a stable energy supply for a reliable
operation.
• Do not connect the loads whose total capacity is greater than the maximum Back-Up
capacity.
• Do not connect the loads that may cause very high start-up current surges, such as non-
frequency conversion air conditioning, vacuum cleaner or half-wave loads such as hair
dryer, heat gun, hammer drill. Refer to "11.2 The Compatibility for Backup under Off-grid
Scenario" for recommended loads.
• Due to the condition of the battery itself, battery current might be limited by some factors,
including but not limited to the temperature and weather.
Declaration For Back-Up Overload Protection
The inverter will restart in case of overload protection. The time required for restarting will in-
crease (5 min at most) if overload protection repeats. Try to reduce Back-Up load power
within maximum limitation or remove the loads which may cause very high start-up current
surges.
2.6.3 Energy Management
The battery discharges to provide energy to loads. If the battery is empty or there is not
enough power from the battery system, the grid shall supply the power, first to Backup loads,
then normal loads.
When the grid is present, the bypass function of the hybrid inverter is activated and the
Backup loads will be directly connected to the grid via the bypass switch integrated in the
inverter.
User Manual 2 Product Description
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